Finding the Fourth Proportional to 1,049.38, 1,570.32 and 987.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,049.38 : 1,570.32 = 987.10 : x
2. Step 2: Convert to fraction form
   1,049.38/1,570.32 = 987.10/x
3. Step 3: Cross multiply
   1,049.38x = 1,570.32 × 987.10
4. Step 4: Simplify right side
   1,049.38x = 1,550,062.87
5. Step 5: Solve for x
   x = 1,550,062.87/1,049.38
6. Step 6: Final answer
   x = 1,477.12